Thanks for the clearification. Yes, most solid body Gibson style guitars will have a mahogany body and neck (most Fenders will be a mixture of woods). I have had very good luck buying both body sets and neck wood from LMI - they are not necessarily from the same tree but mahogany tends to be pretty uniform from on log to the next and, particularly if you use a little color in your pore filling, the pieces seem to match nicely. Here are two guitars with mahogany bodies and necks (all wood from LMI). The first is pretty much a LP clone
And this one is a little more like you are building - LP shaped but with a thin (1/4 cap, in this case flamed spanish cedar), but still mahogany body and neck. Fretboard, binding, pickup rings are all rosewood
On both of those guitars I made the covers for the electronics cavities from a third piece of mahogany, also from LMI - some left over sides or back pieces from some acoustic project. Again, they don't match perfectly but I think they are much better than the typical black Gibson plastic covers.